According to SingTel's press release, 68,000 registered their interest for the phone over 6 days, and the 10,000 appointment slots the purchase the phone at the launch tomorrow were snapped up within an hour and a half.

In comparison, here are M1's prices, which were released on their website:

And StarHub has just opened their website to appointment bookings for registered customers at www.starhub.com/iphone. Here is their price list: